man, you will definitely hear the difference between the 3030 and the virtualizer. the 3030's reverbs are very crisp, smooth, rough, hard, whatever you want to make it do.
the reverbs sound more pro in the 3030. it has a 24bit resolution with an optional digital out board (allthough, personally i woudln't bother, it has balanced XLR's anyway).
the 3030 has an excellent large screen display with 3 real time controls to tweak the verb really quickly. you can get a diagram of how the verb will decay on screen, and all the verbs can be grouped into vocals, drums, ambience, stereo, fx, etc.
no need for sys ex dumps, it has smart media storage. it also has modulation effects....you cant go wrong.
it really does sound good. better than the mpx100. allthough there is a really nice patch on the 100 (i think it's patch 7 on the special fx section).
in my opinion, roland should have marketed this unit a bit more and if they'd put the price up, im sure a lot more people would have taken this unit VERY seriously. take advantage of the cut price, go and get it!
-Romesh